Heat Controller Water Source Heat Pump - Manuals

Section 1 WattMaster WHP 1-2 Design Guide General Information Water Source Heat Pump Units A water source heat pump is a self-contained water-cooled packaged heating and coolingunit with a reversible refrigerant cycle. Its components are typically enclosed in acommon casing, and include a tube-in-tu...

WattMaster WHP Section 1 Design Guide 1-3 Figure 1-1: Typical Water Source Heat Pump During the cooling mode, the tube-in-tube heat exchanger functions as a condenser andthe coil as an evaporator. In heating mode, the tube-in-tube heat exchanger functions asan evaporator and the coil as a condenser....

Section 1 WattMaster WHP 1-4 Design Guide accommodate changes in location and sizes as thermal zones or zone occupancy change.This system is often installed in ceiling plenums, which frees up valuable floor space. Another valuable benefit of water source heat pumps is that they can accommodatesimult...

WattMaster WHP Section 1 Design Guide 1-5 Pump Reset and Aux. Heating or Cooling. An internal seven day schedule and holidayschedule functions are also built into each WHP Controller. With the WHP system the sometimes complex control requirements of a large watersource heat pump system can be handle...

Section 1 WattMaster WHP 1-6 Design Guide WHP Sequence ofOperation HVAC Mode of Operation There are four possible modes of operation. These are Cooling Mode, Heating Mode,Vent Mode, and the Off Mode. The HVAC mode of operation is calculated the same wayin both occupied and unoccupied modes of operat...

WattMaster WHP Section 1 Design Guide 1-7 Occupied/Unoccupied Mode of Operation Since the WHP contains its own built in Real Time Clock, it can operate from its owninternal scheduling system. This schedule supports two Start & Stop events per day andup to 14 Holiday periods. The Holidays all use...

Section 1 WattMaster WHP 1-8 Design Guide HVAC Operation w/ Reversing Relay If the user has configured the WHP to control a Reversing Valve and a Compressor, thefollowing sequence of operation occurs during a heating or cooling demand. Note: If you configure the WHP to look for a proof of flow Enabl...

Section 1 WattMaster WHP 1-10 Design Guide WHP Loop ControllerSequence of Operations Summary The Water Source Heat Pump Loop Controller waits for a Request to Run signal from aHeat Pump or from a Binary Contact Closure. Once the request is received the LoopController activates a Pump to initiate wat...

WattMaster WHP Section 1 Design Guide 1-11 pump exceeds the first pumps run time by the same amount. This keeps both pumps withroughly the same number of hours on each pump. Changeover occurs at the time the runtime setpoint is exceeded. The running pump is shut off at the same time the standbypump ...

Section 1 WattMaster WHP 1-12 Design Guide Heat Rejection Control If the compressor is not running, no heat rejection can be active. If any heat rejection isstill active when the compressor is turned off, the heat rejection will be immediatelyremoved, without regard to any minimum run or off times. ...

WattMaster WHP Section 1 Design Guide 1-13 Staged Heat Addition Heat Addition is staged up based on a different deadband level for each stage. Basically,if the user programmed a 2° deadband, then the first stage could activate at the setpoint,stage 2 would activate 2° below the setpoint, stage 3 wou...

Section 1 WattMaster WHP 1-14 Design Guide Water Temperature Alarming The controlling water temperature is monitored to prevent it from exceeding both a userdefined High and Low Alarm Limit. If either limit is exceeded for a user defined length oftime, an alarm is generated and the compressor output...

Section 2 Installation and Wiring Table of Contents Tips Before Beginning Installation.................................. 1 Communications Loops ................................................... 3 Communications Loop Wiring Overview ....................................................4 WHP Loop Con...

Section 2 Installation and Wiring Table of Figures Figure 2-1: System Overview ........................................................................................2 Figure 2-2: Communication Loop Wiring, Daisy-Chain Configuration .......................4 Figure 2-3: WHP Loop Controller.............

WattMaster WHP Section 2 Installation and Wiring 2-3 Communications Loops The Communications Loop is two wire shielded RS-485. The loop is best connected indaisy chain configuration, meaning the loop is connected from one controller to another.It is not necessary to sequentially address the WHP Cont...

Section 2 WattMaster WHP 2-6 Installation and Wiring WHP Loop Controller The WHP Loop Controller may be installed in any convenient protected location. It isrecommended that the loop controller be mounted indoors in a secure location, that is notsubject to extremes in temperature or moisture. R LY 1...

Section 2 WattMaster WHP 2-10 Installation and Wiring Supply & Retur n Water Temperature Sensors Sensors for monitoring supply and return water temperature are available in two maintypes, fluid immersion temperature sensors (See Figure 2-6) and strap-on sensors (SeeFigure 2-7). Both are 0-10000 ...

WattMaster WHP Section 2 Installation and Wiring 2-13 CommLink II Interface The CommLink II Interface provides for communications between the MiniLinkcommunication interfaces installed on the system. The CommLink II is required forproper communications, even if a PC is not used. Locate the CommLink ...

Section 2 WattMaster WHP 2-14 Installation and Wiring WHP Controller The WHP Controller may be installed in any convenient protected location. Observe therecommended environmental limitations for the WHP Controller when selecting ainstallation location. The environmental limitations are a temperatur...

Section 2 WattMaster WHP 2-18 Installation and Wiring MiniLink Addressing Notes: R SH T R SH T R SH T R SH T All Communication Loop Wiring Is Straight Through 1632 8 4 2 1 Caution!The MiniLinks Must Have Address Switches Set Between 1 And 30 (Up To 30 MiniLinks Are Allowed Per WHP System System). Th...

WattMaster WHP Section 2 Installation and Wiring 2-19 Room Sensors The room sensor uses a patented flush mount design to isolate the temperature sensingelement from the housing which mounts flush with the wall surface. Room sensors should be located on an inside wall away from direct sunlight or hea...

WattMaster WHP Section 2 Installation and Wiring 2-21 Supply Air Temperature Sensor The supply air temperature sensor should be located in the duct, as close to the rooftopunit discharge as possible for best response. Locate the sensor in the center of the widest part of the duct. Use the supplied t...

Section 2 WattMaster WHP 2-22 Installation and Wiring Leaving Water Temperature Sensors The leaving water temperature sensor (optional) when used should be located on theleaving water piping close to the water source heat pump unit. Either a thermowell type ora surface mount sensor may be used depen...

Section 3 Programming Table of Contents LCD/Keypad Operations................................................... 1 System Manager Layout...................................................................................................2Keypad Functions ..................................................

WattMaster WHP Section 3 Programming 3-1 LCD/Keypad Operations Main Screen The Water Source Heat Pump System Manager is the operator’s interface to the statusand setpoints of any WattMaster Water Source Heat Pump (WHP) component on yourcommunications loop. With the System Manager, you can view any t...

Section 3 WattMaster WHP 3-2 Programming System Manager Layout Heat Pump v2.11 Wednesday Operations 7/21/04 04:35 PM Outdoor Air 85.6° Keypad Functions The System Manager keypad is labeled either numerically or as to actual function for thatkey. Below is a summary of the labeled keys and their funct...

WattMaster WHP Section 3 Programming 3-3 System Manager LED Indicators There are two LED indicators located on the right hand side of the System Manager. The top LED indicates an Alarm condition if the Manager detects an alarm conditionwhile polling the system. The bottom LED is active during actual...

Section 3 WattMaster WHP 3-4 Programming Heat Pump StatusScreens View Status Only Status Only View [ Enter Unit ID# ] Selected Unit: 101 By selecting the View Status Only menu item, you canaccess any heat pump or the loop controller and read allavailable temperatures, outputs, and operating conditio...

WattMaster WHP Section 3 Programming 3-5 If you selected menu item #1 View Status Only and you entered the Unit ID of aninstalled WHP Controller, the following Status Screens are available. Status Screen #1 Status Screen #2 Line 2 - Current Zone Temperature Line 3 - Current Cooling Setpoint ( CSP ) ...

Section 3 WattMaster WHP 3-8 Programming View Alarms Alarm Address Locations Alarm Clearing SYSTEM ALARM STATUS Alarm @ Unit ID 118 The System Manager can be programmed to poll all theunits on your heat pump system for alarm information. Thisallows the centrally located System Manager to display anA...

WattMaster WHP Section 3 Programming 3-9 Menu Setpoints Full Setpoint Access Set Time & Date The System Manager has its own built in Real Time Clock. It broadcasts this time once aday, at midnight, to synchronize all of the WHPs on your system. Although the times aredisplayed on the Main Screen ...

Section 3 WattMaster WHP 3-10 Programming Programming Date Daylight Savings Adjustments Month - Enter the Month (1 to 12) Day - Enter the Day of the Month (1 to 31) Year - Enter the current Year with 2 digits (00 to 99) Program Time/Date Month (1-12): 4 Day (1-31): 18 Year (00-99): 04 Daylight Savin...

WattMaster WHP Section 3 Programming 3-11 New Passcodes Programming Passcodes The System Manager has two levels of passcode. Level 1 users are limited to viewing Setpoints and Alarms only. Level 2 users have complete system access. Any status orsetpoint field can be read or reset from WHP System Man...

Section 3 WattMaster WHP 3-12 Programming Rebuild Alarm Map Rebuilding Screens Clearing Old Map .................... ................ Build New Map? (ESC = NO) If you would like the LED Alarm Indicator to function on thefront of your System Manager, you must enable Alarm Pollingby building an Alarm ...

WattMaster WHP Section 3 Programming 3-13 Heat Pump Setpoints Heat Pump Setpoint Menu 1) WHP Setpoints Setpoint Screen #1 1) WHP Setpoints 2) WHP Schedules 3) Reset Pumps ESC) To Exit The Occupied Heating and Cooling Setpoints areprogrammed on this screen. The setpoints must be at least onedegree ap...

WattMaster WHP Section 3 Programming 3-15 Setpoint Screen #5 Setpoint Screen #6 Setpoint Screen #7 WHP #1 Setpoints Min Run Time: x Min Min Off Time: x Min Min Cycle...:xx Min The Min Run Time determines how long the compressormust remain on once it has been activated. The Min Off Timedetermines how...

WattMaster WHP Section 3 Programming 3-17 Setpoint Screen #11 Setpoint Screen #12 Setpoint Screen #13 If your system is configured to use the reversing valve andyou only have one stage of heating and cooling, that lastrelay becomes available for other uses. The AUXILIARYRELAY MODE can be used to ope...

Section 3 WattMaster WHP 3-18 Programming Setpoint Screen #14 Setpoint Screen #15 Setpoint Screen #16 The Heat Pump Controller can use the internal time clock fora setting an occupied schedule, for this the setpoint will be 0.It can also be programmed to follow an external schedulecommand. You must ...

WattMaster WHP Section 3 Programming 3-19 Setpoint Screen #17 Setpoint Screen #18 Setpoint Screen #19 Note: You must do a Rebuild Alarm Map after all controllers are powered up andcommunicating. WHP # 1 Setpoints Heat Stage #2 SAT Lockout: 60 ° F This setpoint is to shut the heating off when the sup...

Section 3 WattMaster WHP 3-20 Programming 2) WHP Schedules The Water Source Heat Pump controllers contain their own built in scheduling capabilityfor calculating Occupied/Unoccupied periods. Select item #2 from Schedules menu toaccess the following schedule programming menu. Schedule Menu Week Sched...

WattMaster WHP Section 3 Programming 3-21 Holidays Holiday Day Selection There are 14 Holiday periods available, organized as a Start Day / Stop Day event. If theHoliday only lasts one day, enter the same date for the Start & Stop days. There is nolimit to the duration or number of days that can...

Section 3 WattMaster WHP 3-22 Programming 3) Reset Pumps WSHPRV 1 v2.03 Tripped Pump Reset Reset Mode: Disabled Use Left/Right Arrow If one of your heat pumps has tripped off, it can be manuallyreset from the following screen. You will have entered theUnit ID to access the WHP Menu screen, so that i...

WattMaster WHP Section 3 Programming 3-23 Loop Controller Status Loop Controller Status Menu From the main menu screen select MENU on the keypad. Then select “View StatusOnly” (keypad #1) and finally enter the loop and zone number for the desired unit. As the screen above shows, there are two areas ...

Section 3 WattMaster WHP 3-24 Programming Status Screen #2 Status Screen #3 Status Screen #4 Loop Control v1.06 No Call to Run Water Flow Proved! LOOP ENABLED Line 2 - Current operating Mode: No Call To RunACTIVE CALL TO RUN FREEZE PROTECTION! Line 3 - Current Water Flow Status: Water Flow Proved! N...

Section 3 WattMaster WHP 3-26 Programming Status Screen #7 Note: If no alarms exist, then the screen displays the message shown for No Alarms! If ANY alarm exists, then the three lines display one of the messages shown above. The Fire/Smoke Alarm is generated as follows: If the NC (normally closed) ...

WattMaster WHP Section 3 Programming 3-27 Loop Controller Setpoints Loop Controller Setpoint Menu Setpoint Screen #1 Setpoint Screen #2 1) LC Setpoints 2) LC Schedules 3) LC Force Modes ESC) To Exit If the controlling water temperature rises above this Setpoint,the Heat Rejection or Cooling Stages b...

WattMaster WHP Section 3 Programming 3-29 Setpoint Screen #6 Setpoint Screen #7 Setpoint Screen #8 If the controlling water temperature rises above the Water HiLimit setpoint, all heat addition will be removed and onestage of heat rejection will be activated. If the controllingwater temperature drop...

WattMaster WHP Section 3 Programming 3-31 Setpoint Screen #12 Setpoint Screens #13 Note: Due to memory limitations in the Loop Controller, the maximum amount ofcalibration offset is 10.0 ° F. Setpoint Screen #14 Setpoint Screen #15 If you configured the system for Variable Speed Pumping with aPressu...

Section 4 Start-Up and Troubleshooting Table of Contents 1.0 Communications Overview........................................ 1 1.1 How It Works ...........................................................................................................11.2 WattMaster WHP System .........................

WattMaster WHP Section 4 Start-Up and Troubleshooting 4-1 1.0 Communications Overview Perhaps no other portion of the system seems as difficult to diagnose as the communica-tions loop, yet it really can be quite simple if you understand how it works. In fact, muchof the troubleshooting can be done b...

WattMaster WHP Section 4 4-4 Start-Up and Troubleshooting 2.0 WHP Controller Overview 2.1 How It Works 2.1.1 Initialization On system powerup the COMM LED remains extinguished for five seconds. After thisdelay, the COMM LED will blink out the address of the controller (Address SwitchSetting). The CO...

WattMaster WHP Section 4 Start-Up and Troubleshooting 4-5 2.2 Becoming Familiar with the WHP Controller RELAY OUTPUT COM 1-3 OUT OUT 12 COM 4-5 OUT OUTOUT 3 4 5 24VAC GND PWR COMM TSHLD LD4 REC. 12VAIN 123 45 GNDGND AOUT AIN AINAINAIN 4-5 OUT COMM TEST 32K 8K RAM EPROM ADDRESS ADD PRESSURE SENSOR 48...

WattMaster WHP Section 4 4-6 Start-Up and Troubleshooting 2.2.2 Analog Inputs This connector carries the analog and binary control input signals. AIN1 - Space Temp - This input accepts a two wire 10K Type III thermistor tem-perature sensor. The sensor measures 10,000 Ohms @ 77 ° F. The resistance dr...

WattMaster WHP Section 4 Start-Up and Troubleshooting 4-7 OUT3 - Compressor or Heat 2 - This output enables the compressor if you haveconfigured the WHP Controller for a compressor and reversing valve configura-tion. If the WHP Controller is configured for individual staging of heating andcooling (n...

WattMaster WHP Section 4 4-8 Start-Up and Troubleshooting 2.2.6 WHP Controller Wiring Figure 4-4: Typical WHP Controller Wiring Diagram Communication LED

WattMaster WHP Section 4 Start-Up and Troubleshooting 4-9 3.0 Loop Controller Overview 3.1 How It Works 3.1.1 Initialization On system powerup LED2 remains extinguished for five seconds. After this delay, theLED2 will blink out the address of the controller (Address Switch Setting). The LED2will the...

WattMaster WHP Section 4 4-10 Start-Up and Troubleshooting 3.2 Loop Controller Inputs & Outputs 3.2.1 Analog Inputs AIN1 - Return Water Temp - This input accepts a two wire 10K Type III ther-mistor temperature sensor. The sensor measures 10,000 Ohms @ 77 ° F. The re- sistance drops as the temper...

WattMaster WHP Section 4 Start-Up and Troubleshooting 4-11 3.2.3 Binary Output R1 – Compressor Enable – Energizes the first stage of cooling. R2 – Main Pump – Energizes the lead water pump. R3 – Standby Pump – Energizes the standby pump if the main pump fails tostart. R4 – Alarm Indicator – Energize...

WattMaster WHP Section 4 4-12 Start-Up and Troubleshooting 3.2.6 Comm Connector - Communications RS-485 Communications Connector - This connector provides the connection point forthe Local Loop RS-485 communications loop. The wiring consists of a twisted pair ofwires with a shield. T - RS-485 (+) Co...

WattMaster WHP Section 4 4-14 Start-Up and Troubleshooting 4.0 Start-Up 4.1 Blink Codes for WHP Controllers The WHP Controller uses an on board LED to indicate various diagnostic conditionsduring powerup and operation. The WHP Unit LED is labeled “COMM”. Starting withpower up the LED blink codes are...

WattMaster WHP Section 4 Start-Up and Troubleshooting 4-15 4.2 Blink Codes for Loop Controllers The Loop Controller uses an on board LED to indicate various diagnostic conditionsduring powerup and operation. The Loop Controller Unit LED is labeled “LED2”.Starting with power up the LED blink codes ar...

WattMaster WHP Section 4 4-16 Start-Up and Troubleshooting 4.4 Installation and Commissioning Information Familiarize yourself with the installation manual and system wiring diagramsbefore installing! 1. Check to see if you have all the correct components for your installation. 2. Establish the loca...

WattMaster WHP Section 4 Start-Up and Troubleshooting 4-19 4.5 Setting Address Switches 4.5.1 Setting the MiniLink Address Switch L O O P N E T WO R K LOOPADDRESS SWITCH ADDRESS SWITCH SHOWN ISSET FOR ADDRESS 1 ADDRESS SWITCH SHOWN ISSET FOR ADDRESS 13 LOOPADDRESS SWITCH T SH R 24VAC GND T SH R 32 1...

WattMaster WHP Section 4 4-20 Start-Up and Troubleshooting 4.5.2 Loop Controller Addressing The Loop Controller address should always be set for address #30. A maximum of 29WHP Controllers on the loop that contains the Loop Controller. All other loops may have30 WHP Controllers. (Refer to Figure 2-1...

WattMaster WHP Section 4 Start-Up and Troubleshooting 4-21 5.0 Troubleshooting 5.1 General Troubleshooting The following is a guide to assist in troubleshooting the WattMaster WHP System. It isprovided as a systematic approach to determining and resolving common systemproblems. 5.1.1 Communications ...

WattMaster WHP Section 4 4-22 Start-Up and Troubleshooting 5.1.2 General Troubleshooting Checklist Begin troubleshooting by locating the general problem in the list below. Detailedcomponent troubleshooting information follows later in this section. Zone is too warm • Is zone calling for cooling? • I...

WattMaster WHP Section 4 4-24 Start-Up and Troubleshooting 5.3 Checking Comm. Loop Voltages 5.3.1 Checking the CommLink II Network Loop Diagram Overview This test checks for proper Network loop voltages at the CommLink II. Tip: The Loop LED (located on the front panel) should “flicker” when the Comm...

WattMaster WHP Section 4 Start-Up and Troubleshooting 4-25 5.3.2 Checking the Comm Loop at the CommLink II Diagram The indicated values are typical of a normal system, actual readings may deviate slightlydue to the number of units connected and other system specific factors. Note: All of the connect...

WattMaster WHP Section 4 4-26 Start-Up and Troubleshooting 5.3.3 Checking the CommLink II Driver Diagram Overview This test checks for proper Network loop voltages coming from the CommLink II. Tip: The Loop LED (located on the front panel) should “flicker” when the CommLink II is attempting to commu...

WattMaster WHP Section 4 Start-Up and Troubleshooting 4-27 5.3.4 Checking the MiniLink Network Loop Diagram Meter Set To Read DC Volts The indicated readings are typical of a normally operating system. Actual readings mayvary slightly due to the number of units installed and other factors. Any signi...

WattMaster WHP Section 4 4-28 Start-Up and Troubleshooting 5.3.5 Checking the MiniLink Network Driver Diagram Meter Set To Read DC Volts Note: These tests assume that the MiniLink being checked is powered up Overview This check is intended to determine if the Network Comm Driver chip on a MiniLink i...

WattMaster WHP Section 4 Start-Up and Troubleshooting 4-29 5.3.6 Checking the MiniLink Local Loop Diagram Meter Set To Read DC Volts The indicated readings are typical of a normally operating system. Actual readings may varyslightly due to the number of units installed and other factors. Any signifi...

WattMaster WHP Section 4 4-30 Start-Up and Troubleshooting 5.3.7 Checking the Local Loop at MiniLink Diagram Meter Set To Read DC Volts The indicated values are typical of a normal system. Actual readings may deviate slightlydue to the number of units connected and other system specific factors Note...

WattMaster WHP Section 4 4-32 Start-Up and Troubleshooting 5.3.8 Checking the MiniLink Local Loop Driver Diagram Meter Set To Read DC Volts The indicated values are typical of a normal operating system. Actual readings may deviateslightly. Note: These tests assume that the MiniLink is powered up. Ov...

WattMaster WHP Section 4 Start-Up and Troubleshooting 4-33 5.3.9 Checking the Local Loop at a WHP Controller Diagram Meter Set To Read DC Volts The indicated readings are typical of a normal operating system. Actual readings may varyslightly due to the number of units installed and other factors. An...

WattMaster WHP Section 4 4-34 Start-Up and Troubleshooting 5.3.10 Checking WHP Controller Driver Chip Diagram Meter Set To Read DC Volts Note: These tests assume that the controller being checked is powered up. Overview This check is intended to determine if the Comm Driver chip on a controller is d...

WattMaster WHP Section 4 Start-Up and Troubleshooting 4-35 5.4 Troubleshooting Loop Controller 5.4.1 Checking the Loop Controller Analog Inputs Diagram Overview 12V GND AIN1 AIN2 AIN3 AIN4 AOUT2 GND + - R SET METER TO READ DC VOLTS ALL READINGS ARE TAKENWITH THE (-) LEAD OF THEMETER ON THE GNDTERMIN...

WattMaster WHP Section 4 4-36 Start-Up and Troubleshooting 5.4.1 (continued) AIN4 Outdoor Air Temp 1.9 volts (100 ° F) - 3.6 volts (40 ° F) Typical is 2.5 volts @ 77 ° F AIN5 Manual Reset If the input is OPEN, the voltage will be greater than 5.0 volts If the input is CLOSED, the voltage will be les...

WattMaster WHP Section 4 Start-Up and Troubleshooting 4-37 5.4.2 Checking the Loop Controller Outputs Diagram Overview 12V GND AIN1 AIN2AIN3 AIN4 AOUT2 GND + - R SET METER TO READ DC VOLTS ALL READINGS ARE TAKENWITH THE (-) LEAD OF THEMETER ON THE GNDTERMINAL + AIN5 AIN7 GND AOUT1 - The analog outpu...

WattMaster WHP Section 4 4-38 Start-Up and Troubleshooting 5.4.3 Checking the Local Loop at a WHP Loop Controller Diagram Meter Set To Read DC Volts The indicated readings are typical of a normal operating system. Actual readings may varyslightly due to the number of units installed and other factor...

WattMaster WHP Section 4 Start-Up and Troubleshooting 4-39 5.4.4 Checking WHP Loop Controller Driver Chip Diagram Meter Set To Read DC Volts Note: These tests assume that the controller being checked is powered up. Overview This check is intended to determine if the Comm Driver chip on a controller ...

WattMaster WHP Section 4 4-40 Start-Up and Troubleshooting 5.4.5 Comm Driver Chip Replacement LOOP CONTROLLER CPU BOARD COMM DRIVER CHIP ( U1 ) PIN 1 COMMLINK II COMMUNICATIONS DRIVER CHIP WHP CONTROLLER MINILINK COMMUNICATIONS INTERFACE PIN 1 WHP CONTROLLER COMM DRIVER CHIP ( U5 ) WARNING! USE EXTR...

WattMaster WHP Section 4 Start-Up and Troubleshooting 4-41 5.5 Temperature Sensor Resistance Chart TEMPERATURE º F RESISTANCE Ω* VOLTAGE AT INPUT* 82 8893 2.407 84 8514 2.352 86 8153 2.297 88 7805 2.242 90 7472 2.187 95 6716 2.055 100 6047 1.927 105 5453 1.805 110 4923 1.687 115 4449 1.575 120 4030 ...

WattMaster WHP Section 4 4-42 Start-Up and Troubleshooting 5.6 Pressure Sensor Voltage Chart PRESSURE PSI CURRENT MILIAMPS VOLTAGE AT INPUT VDC* 0 4.00 1.00 1 4.32 1.08 2 4.64 1.16 3 4.96 1.24 4 5.28 1.32 5 5.60 1.40 6 5.92 1.48 7 6.24 1.56 8 6.56 1.64 9 6.88 1.72 10 7.20 1.80 11 7.52 1.88 12 7.84 1...